Mahouka Koukou no Rettousei - Kyuukousen-hen - Vol. 4 Ch. 19 - The Weak Point, Part 3

[MangaDex]

 

[Sancturil]

Oh, so Tatsuya did use that technique to knock out mages again. Nice. I had forgotten that he used it here. At least this means that it's not a one-time thing from the first arc of the series.